Performance of nano-sized Au/TiO2 for selective catalytic reduction of NOx by propene

Nano-sized gold particles supported on titania catalysts (Au/TiO2) were prepared by metal sol method. The catalytic activity of the nano-sized Au/TiO2 catalysts for selective catalytic reduction (SCR) of NOx by propene in the presence of excess oxygen was investigated. The maximum NOx conversion to N2 over Au (1 wt.%)/TiO2 was obtained at 325 °C which is relatively lower than was the case for Au/Al2O3. Anatase crystalline type is preferable for Au/TiO2 catalyst because of the higher NOx reduction and C3H6 oxidation performance at low temperatures compared with the rutile form. When the Au loading was lowered to 0.1 wt.%, the peak temperature shifted to 375 °C but the maximum NOx conversion remained the same as that of 1 wt.% Au loading sample. The full width at half maximum of conversion (FWHM) increased significantly as the loading of Au decreased. FWHM of 0.1 wt.% Au loading was almost two times wider than that of the 1 wt.% Au loading sample. The effect of feed composition, including moisture, was also investigated.

Nano-sized gold particles on titania catalysts were prepared by metal sol method. The catalytic activity for selective catalytic reduction of NOx by C3H6 was evaluated in the excess oxygen condition. At very low Au loading of 0.1%, good catalytic performance and a relatively wide operation window were achieved, although the peak temperature shifted to slightly higher temperature. Figure optionsDownload as PowerPoint slide